In the FBD model there is one fit parameter, namely \(s_{inj}\) , which is
defined as the excess of the total length of the combined
system over the length of the initial system (at the touching
configuration) when the neck-zip process brings the system to
the asymmetric fission valley. Based on the nuclear masses and fission barriers deduced from the energy maps (as shown above for \(^{276}110\)  and \(^{294}118\) ) one can adjust
this parameter to the experimental synthesis cross section at the maximum of a given (xn) excitation function.
Details of this fit procedure with the specification of reaction data used can found in [1]}.
The compilation of the so-deduced \(s_{inj}\)  values is displayed in Fig. REF 
as a function of the kinetic energy excess \(E_{c.m.}\)  - \(B_{0}\)  above the Coulomb barrier \(B_{0}\)  in the case of two sets of theoretical input data:
based on the deformed Woods-Saxon model [2]}, [3]} described here (left panel) and assuming the fission-barrier heights [4]} and
the ground-state masses [5]} of P. Möller et al. (right panel).
<FIGURE>